linux-kernel - Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable

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Date:	Tue, 8 Aug 2006 18:32:42 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Paulo Marques <pmarques@...popie.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Stephen Hemminger <shemminger@...l.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable

On Tue, Aug 08, 2006 at 06:28:28PM +0100, Paulo Marques wrote:
> Just one side note: kallsyms_lookup_name is _really_ inefficient. The 
> kallsyms structure is tailored so that kallsyms_lookup (the most 
> frequently used function) is really fast. Doing it the other way around 
> involves a O(N) search, uncompressing every symbol name as it goes :P
> 
> I don't think this is really a performance problem for users like 
> kprobes, but I just wanted people to keep in mind that there is a 
> penalty involved in calling kallsyms_lookup_name.

That's true.  One more reason to not expose this interface to the public.
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